1. Because this pagoda tree leaf comes from the "old country" and is stained with the "soil" of the old country, it is the "most precious" one; Because it left the "soil" that raised it and the branches that grew it, it was the "saddest" piece.

2. The advantage of this writing is that on the surface, it is the author's recollection of the origin of Sophora japonica leaves, but in fact it is enough to express that it comes from the motherland.